Materials Literature
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We have been using the method of tube-arrest as a means of producing transient single cavitation bubble. In the present paper we seek to comprehend the mechanism of production and inquire into the structure of the ab initio pressure field in the arrested liquid column. The generated pressure wave is shown by combining…
Abstract The compound, Ti 3 Al 0.7 Si 0.3 C 2 , was synthesized by hot pressing a powder mixture of TiC X (x = 0.6), Al and Si. Its oxidation at 900 and 1000 °C in air for up to 50 h resulted in the formation of rutile‐TiO 2 , α‐Al 2 O 3 and amorphous SiO 2 . The oxide scales formed consisted of triple layers, viz , a…
A detailed mathematical model of a direct internal reforming solid oxide fuel cell (DIR-SOFC) incorporating with simulation of chemical and physical processes in the fuel cell is presented. The model is developed based on the reforming and electrochemical reaction mechanisms, mass and energy conservation, and heat tra…
The electrochemical corrosion behaviors of indium tin oxides (ITO) films were investigated by electrochemical methods in sodium hydroxide solutions. Cyclic voltammetries of ITO films at both anodic and cathodic polarization were carried out. Transmittance spectra, scanning electron microscopy (SEM) and X-ray diffracti…
Nitrogen-doped ZnO (ZnO:N) films are prepared by thermal oxidation of sputtered Zn 3 N 2 layers on Al 2 O 3 substrates. The correlation between the structural and optical properties of ZnO:N films and annealing temperatures is investigated. X-ray diffraction result demonstrates that the as-sputtered Zn 3 N 2 films are…
The well-defined structure of lipid A-diphosphate in aqueous solutions provides a way of observing the formation of calcium carbonate crystals. The crystals are either tetrahedral or rhombohedral calcite at a volume fraction of phi = 5.4 x 10 (-4) at pH 5.8 or the vaterite polymorph of CaCO(3) at a volume fraction of…
Processing routes to make oxide ceramic foams of porosity more than 70% with pore sizes in the range of 0.1–4 mm are reviewed. Microstructures and mainly characteristics of pores produced by incorporation of fugitives, infiltration through 3D-preforms, direct casting of foams are compared. Emphasis has been given to t…
Novel fluoride‐teminated hyperbranched poly(ether ether ketone) with 4‐phenoxyphenyl side group (HPEEK‐F) was prepared from 2‐(4‐phenoxyphenyl)‐1,4‐diphenol (A2) and 1,3,5‐tris[4‐(4‐flourobenzoyl) phenoxy]benzene (B3). An end‐capping approach was used to synthesize tertiary amino‐terminated fluorescent (HPEEK‐DMA) and…
It is a widely adopted approach to woven fabric design in industry, to define the construction parameters of the fabric to give a certain fabric unit weight. It is also equally important, from the engineering point of view, to design a fabric which fulfils the conditions of weavability and certain quality criteria. It…
The synthesis of catalytic filamentous carbon (CFC) on catalysts prepared by supporting Ni 2+ compounds onto the surface of various alumina modifications (macroporous α-Al 2 O 3 and mesoporous ϑ-Al 2 O 3 and δ-Al 2 O 3 ) using two procedures (impregnation and homogeneous precipitation) was studied. The texture charact…
Polyaniline (PANI)-based composite materials containing 5 to 65 wt % of multi-wall carbon nanotubes (MCNT) are prepared. Their electrochemical characteristics are studied, in particular, the effect of the MCNT content in the composite on the composite and PANI specific capacitance. The increase in the composite capaci…
We have synthesized heterostructured ZnO:S/ZnO 6-fold nanorotors through a one-step catalyst-free process during chemical vapor deposition. We performed a series of designed experiments to investigate the effect of growth temperatures, growth time, and the ratios between ZnO and FeS used as starting material on the gr…
The cubic perovskite-type SrFeO3 have been obtained by annealing under high oxygen pressure of 100 MPa at 600K. X-ray absorption fine structure (XAFS) observations on Fe K-edge have been performed from 25 K to 900 K to investigate the temperature variation of the local structure and oxidation state of iron ion in the…
In developing an effective production technology for bearing steel, attention focuses on the detection of the groups of nonmetallic inclusions that most impair the performance of IIIX15 steel. Converter production of bearing steel is promising in terms of compliance with current quality requirements.
The recovery of tritium, T, from neutron-irradiated Li by a Y plate was experimentally investigated, and a Y hot trap was designed to remove T from a flowing Li target loop of IFMIF. T generated in Li ranging from 0.01 to 0.05ppm in molar fraction was successfully removed by a Y plate at 300-500°. The ratio of recover…
The basic techniques of manufacturing of metal-polymer type hybrid elements were presented. Insert technique consists in preparation of elements with metal mold inserts by injection molding method. Outsert technique let improve the functionality of simple metal profiles by injection molding of polymer sub-elements. In…
Ferroelectric materials of Ba0.95RE0.05TiO3 and LiNb0.95RE0.05O3 (RE3+ = Eu3+, Sm3+, Dy3+ and Pr3+) have been prepared by a conventional solid state sintering method. By measuring excitation and emission spectra of the prominent emission bands, luminescence performance of these optical materials has been investigated.…
The development of optical gain in semiconductor nanocrystals requires a high concentration of electronic excitation energy. Generating and maintaining such a high excitation density is difficult because of fast Auger relaxation channels that operate under such conditions. In this article, the use of energy transfer w…
Energy-dispersive X-ray microanalysis technique has been widely used in failure analysis of wafer fabrication. However, we still face some common problems. In this study, we will introduce standardless element coefficients to improve accuracy of quantitative results, propose an estimating method to select beam acceler…
Technologies for manufacturing and poling the dynamic pressure gage based on ferroelectric polyvinylidene fluoride polymer are described. Results of theoretical and methodical investigations of the gage and pressure profiles measured with this gage behind the shock wave front in solids are presented.